Overheat no leaks water inside expension don't flow to radiator

Good Day
You have an internal radiator that the water flows through when you turn on the heating this is from your normal water supply that cools your motor, I suggest that you have this radiator checked as it might be leaking inside the car. Be careful that your water in your engine's radiator does not become to low to cool your engine efficiently, may I suggest you keep your heater off until you have had this assessed for safety reasons and to stop damage to your motor as far as it may overheat without water or without sufficient water.

How do you stop the Chev Impala running overheated?

You don't want to be running the engine in an overheat condition or you will cause very expensive engine damage many times what it will cost you to fix the current issue. It can be running hot for many reasons so have a competent professional mechanic check it over without delay and identify the cause(s). The causes can be many as outlined below:

1. You may have radiator coolant loss from an external leak source in the cooling system or a coolant leak from inside the engine that is resulting in a low coolant level.

2. You may have a partial blockage in the system from debris in the radiator or in the engine coolant passages that is retarding coolant flow through the cooling system.

3. The coolant thermostat may be sticking and not fully opening which will retard the very hot coolant flow from the engine to the radiator.

4. The water pump may be failing from badly corroded impeller blades but this is less likely on your 2008 but still a possibility.

5. You may have compression gasses from the engine leaking into the cooling system via a failed cylinder head gasket. In that event bubbles will show up in the coolant and the coolant will overheat.

6. Your radiator cap may be faulty and may be allowing coolant to flow into the overflow reservoir but not back again into the radiator during the cool down when the engine is off.

As mentioned, have it investigated and the cause identified without delay to avoid expensive engine damage.

Has the system been flushed? Correct temperature thermostat installed? Are you getting flow through the radiator? Rad cap sealing properly and is it the correct one? Are the fans actually coming on? Is the temp sensor working properly? Rad properly filled or still have air trapped inside? Water level correct? Water pump working or seized, leaking?

eventually yes. with bad results. in the mean time keep topping up your radiator with coolant. not just water as this can corrode the water jacket inside the engine and restrict coolant flow. i would replace the radiator soon as.

The radiator sheds heat at a specific rate. Increasing air flow increases that rate a bit, but even with increased air flow, there is a specific rate.

When you start out, there is a "cold reservoir" in the radiator — without shedding any heat at all, for a while the cold water in the radiator will keep the engine cool.

If the heat from the engine exceeds the heat the radiator can shed, as soon as the radiator water hits the temperature of the engine, you will have overheating.

If you have a head gasket leak, you are injecting heat directly into the water, heat that ought to go out the tailpipe.

If some of the tubes in the core of the radiator are not flowing, the ability of the radiator to shed heat will be diminished.

I am thinking it is either a head gasket leak/cracked combustion chamber, or a radiator that does not flow water through all the tubes.

A lean fuel mixture will generate a lot more heat than one that is richer. The coloration of the spark plug insulators can be helpful in assessing the mixture.

if it was a head gasket it would overheat long before 20-30 miles if there is no sign of water leaking from hoses etc when the car has warmed up it is most probably the radiator or possibly the water pump or thermostat has called it a day

your heater has apparently restricted the coolant flow....hopefully a good system back flushing will cure the problem....use a flush obtained from a parts house....I would buy the hose kit for flushing as well...good luck to you

The problem with overheat is due to poor coolant circulating. The main culprit is the Radiator. When the radiator is clogging up, coolant can't be circulating. The stagnant coolant inside the engine water jacket keeps absorb heat from combustion chambers having no way to dissipate the heat then the engine is overheated. You can test the water pump by removing the thermostat, then hooking everything back. Open the radiator cap, then turn on the engine to see if water flowing down to several small tubes inside the radiator. If water can't go down fast enough to cause over flow at radiator opening then your 90 Legend Radiator already got clogged up. Replace with a new radiator, not even a rebuilt one. Good luck.

The engine overheat is due to inefficient cooling. Therefore, there is coolant in the radiator but if it doesn't circulate inside the engine water-jacket to remove the heat generated from combustion's chambers, then it still causes overheat. If this keeps happening then it can cause the engine head wrapped then leaking from the gasket as people called blowed head gasket. It could be: 1- Thermostat is not opened. 2- Water pump is not working. Before starting to replace parts, it needs to verify it it is the root cause of the problem. Take out the thermostat and run the engine to feel if there is water flowing inside the upper hose. A- If it is not then water pump is not working. B- If is, then run the car a few days without thermostat to see if it causes overheated. C- Running car without thermostat still causes overheat then there are some clogging up in the water jacket defeating the cooling efficiency--> Need a good flush. Good luck.

First things first, with the engine COLD, remove the radiator cap and look inside...top off with water if low or empty.

If you have to add more than a cup of water to the inside of the radiator then you have a coolant leak in the system somewhere and that is why I said every GOOD mechanic will first pressure test the cooling system for leaks before doing any repairs like a water pump.

It still sounds like you either have:

A. Don't have enough coolant inside the radiator to keep the cool...thus you have a leak somewhere

or

B. You have a restriction somewhere...probably in the radiator which is not allowing coolant to flow throughout the engine and heater core.